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            <h3 id="react核心功能"><a href="#react核心功能" class="headerlink" title="react核心功能"></a>react核心功能</h3><p>react 15 之前,分为 <code>Reconciler</code>  <code>Render</code></p>
<blockquote>
<p><code>Reconciler</code> 用于判断哪些节点变化了，将变化的情况告诉render 15之前是递归进行判断<br><code>Render</code> 用于生成虚拟节点树<br>react16，加了一个协调器 <code>Scheduler</code>, 当浏览器有剩余时间时通知我们，这个时候Reconciler的递归将允许终止，在浏览器没有剩余时间的时候，终止Reconciler, <code>shouldYield</code> 便是调用协调器中的方法</p>
</blockquote>
<div class="highlight-container" data-rel="Plaintext"><figure class="iseeu highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line">/** @noinline */</span><br><span class="line">function workLoopConcurrent() &#123;</span><br><span class="line">  // Perform work until Scheduler asks us to yield</span><br><span class="line">  while (workInProgress !== null &amp;&amp; !shouldYield()) &#123;</span><br><span class="line">    workInProgress = performUnitOfWork(workInProgress);</span><br><span class="line">  &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure></div>

<h3 id="Fiber-结构"><a href="#Fiber-结构" class="headerlink" title="Fiber 结构"></a>Fiber 结构</h3><div class="highlight-container" data-rel="Plaintext"><figure class="iseeu highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br></pre></td><td class="code"><pre><span class="line">function FiberNode(</span><br><span class="line">  tag: WorkTag,</span><br><span class="line">  pendingProps: mixed,</span><br><span class="line">  key: null | string,</span><br><span class="line">  mode: TypeOfMode,</span><br><span class="line">) &#123;</span><br><span class="line">  // 作为静态数据结构的属性</span><br><span class="line">  this.tag = tag;</span><br><span class="line">  this.key = key;</span><br><span class="line">  this.elementType = null;</span><br><span class="line">  this.type = null;</span><br><span class="line">  this.stateNode = null;</span><br><span class="line"></span><br><span class="line">  // 用于连接其他Fiber节点形成Fiber树</span><br><span class="line">  this.return = null;</span><br><span class="line">  this.child = null;</span><br><span class="line">  this.sibling = null;</span><br><span class="line">  this.index = 0;</span><br><span class="line"></span><br><span class="line">  this.ref = null;</span><br><span class="line"></span><br><span class="line">  // 作为动态的工作单元的属性</span><br><span class="line">  this.pendingProps = pendingProps;</span><br><span class="line">  this.memoizedProps = null;</span><br><span class="line">  this.updateQueue = null;</span><br><span class="line">  this.memoizedState = null;</span><br><span class="line">  this.dependencies = null;</span><br><span class="line"></span><br><span class="line">  this.mode = mode;</span><br><span class="line"></span><br><span class="line">  this.effectTag = NoEffect;</span><br><span class="line">  this.nextEffect = null;</span><br><span class="line"></span><br><span class="line">  this.firstEffect = null;</span><br><span class="line">  this.lastEffect = null;</span><br><span class="line"></span><br><span class="line">  // 调度优先级相关</span><br><span class="line">  this.lanes = NoLanes;</span><br><span class="line">  this.childLanes = NoLanes;</span><br><span class="line"></span><br><span class="line">  // 指向该fiber在另一次更新时对应的fiber</span><br><span class="line">  this.alternate = null;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure></div>

<h3 id="fiber-使用双缓存更新节点"><a href="#fiber-使用双缓存更新节点" class="headerlink" title="fiber 使用双缓存更新节点"></a>fiber 使用<code>双缓存</code>更新节点</h3><blockquote>
<p>双缓存：在内存中构建并直接替换</p>
</blockquote>
<h2 id="fiber-是如何使用双缓存去更新节点的？"><a href="#fiber-是如何使用双缓存去更新节点的？" class="headerlink" title="fiber 是如何使用双缓存去更新节点的？"></a>fiber 是如何使用<code>双缓存</code>去更新节点的？</h2><p>fiber 有两个变量，<code>fiberRoot</code> 和 <code>rootFiber</code>， 其中<code>fiberRoot</code>是应用的总跟节点，<code>rootFiber</code>是每次更新或者创建的树的跟节点，<code>fiberRoot.current</code> -&gt; <code>rootFiber</code>, 因为fiber 框架会在内存中构建两个树， current 和 workingInProgress 树，两个树的节点会用alternate属性连接，workingInProgress在commit后会被转成current ，由fiberRoot.current 指向。通过diff算法进行更新</p>

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        <li><strong>标题:</strong> react Fiber</li>
        <li><strong>作者:</strong> jiesun</li>
        <li><strong>创建于
                :</strong> 2020-10-12 20:34:45</li>
        
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                <strong>更新于
                    :</strong> 2023-08-27 00:04:17
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        <ol class="nav"><li class="nav-item nav-level-3"><a class="nav-link" href="#react%E6%A0%B8%E5%BF%83%E5%8A%9F%E8%83%BD"><span class="nav-text">react核心功能</span></a></li><li class="nav-item nav-level-3"><a class="nav-link" href="#Fiber-%E7%BB%93%E6%9E%84"><span class="nav-text">Fiber 结构</span></a></li><li class="nav-item nav-level-3"><a class="nav-link" href="#fiber-%E4%BD%BF%E7%94%A8%E5%8F%8C%E7%BC%93%E5%AD%98%E6%9B%B4%E6%96%B0%E8%8A%82%E7%82%B9"><span class="nav-text">fiber 使用双缓存更新节点</span></a></li></ol></li><li class="nav-item nav-level-2"><a class="nav-link" href="#fiber-%E6%98%AF%E5%A6%82%E4%BD%95%E4%BD%BF%E7%94%A8%E5%8F%8C%E7%BC%93%E5%AD%98%E5%8E%BB%E6%9B%B4%E6%96%B0%E8%8A%82%E7%82%B9%E7%9A%84%EF%BC%9F"><span class="nav-text">fiber 是如何使用双缓存去更新节点的？</span></a>

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